[PATCH 1/2] ACPI: utils: Add acpi_reduced_hardware() helper

* [PATCH 1/2] ACPI: utils: Add acpi_reduced_hardware() helper
@ 2021-04-06 21:16 ` Hans de Goede
  0 siblings, 0 replies; 16+ messages in thread
From: Hans de Goede @ 2021-04-06 21:16 UTC (permalink / raw)
  To: Rafael J . Wysocki, Len Brown, Zhang Rui
  Cc: Hans de Goede, intel-gfx, linux-acpi

Add a getter for the acpi_gbl_reduced_hardware variable so that modules
can check if they are running on an ACPI reduced-hw platform or not.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
 drivers/acpi/utils.c    | 11 +++++++++++
 include/acpi/acpi_bus.h |  1 +
 include/linux/acpi.h    |  5 +++++
 3 files changed, 17 insertions(+)

diff --git a/drivers/acpi/utils.c b/drivers/acpi/utils.c
index 682edd913b3b..4cb061d3169a 100644
--- a/drivers/acpi/utils.c
+++ b/drivers/acpi/utils.c
@@ -872,6 +872,17 @@ acpi_dev_get_first_match_dev(const char *hid, const char *uid, s64 hrv)
 }
 EXPORT_SYMBOL(acpi_dev_get_first_match_dev);
 
+/**
+ * acpi_reduced_hardware - Return if this is an ACPI-reduced-hw machine
+ *
+ * Return true when running on an ACPI-reduced-hw machine, false otherwise.
+ */
+bool acpi_reduced_hardware(void)
+{
+	return acpi_gbl_reduced_hardware;
+}
+EXPORT_SYMBOL(acpi_reduced_hardware);
+
 /*
  * acpi_backlight= handling, this is done here rather then in video_detect.c
  * because __setup cannot be used in modules.
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index f28b097c658f..d631cb52283e 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -78,6 +78,7 @@ acpi_evaluate_dsm_typed(acpi_handle handle, const guid_t *guid, u64 rev,
 
 bool acpi_dev_found(const char *hid);
 bool acpi_dev_present(const char *hid, const char *uid, s64 hrv);
+bool acpi_reduced_hardware(void);
 
 #ifdef CONFIG_ACPI
 
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 3bdcfc4401b7..e2e6db8313c8 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -748,6 +748,11 @@ acpi_dev_get_first_match_dev(const char *hid, const char *uid, s64 hrv)
 	return NULL;
 }
 
+static inline bool acpi_reduced_hardware(void)
+{
+	return false;
+}
+
 static inline void acpi_dev_put(struct acpi_device *adev) {}
 
 static inline bool is_acpi_node(const struct fwnode_handle *fwnode)
-- 
2.30.2


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